CLOCK CONTROL CIRCUIT, RECEIVER, AND COMMUNICATION DEVICE
First Claim
1. A clock control circuit comprising:
- a first buffer that receives a first pair of input clocks of multi-phase clocks, buffers and outputs the first pair of input clocks;
a second buffer that receives a second pair of input clocks of the multi-phase clocks, and is controllable to buffer and output the second pair of input clocks or to output a fixed level; and
a frequency multiplier that performs a logical operation on an output of the first buffer and an output of the second buffer, and outputs a first pair of output clocks or a second pair of output clocks as an output clocks, the first pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the multi-phase clocks, and the second pair of output clocks is based on the same frequencies as the multi-phase clocks.
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Accused Products
Abstract
A clock control circuit includes: a first buffer that receives a first pair of input clocks of multi-phase clocks, buffers and outputs the first pair of input clocks; a second buffer that receives a second pair of input clocks of the multi-phase clocks, and is controllable to buffer and output the second pair of input clocks or to output a fixed level; and a frequency multiplier that performs a logical operation on an output of the first buffer and an output of the second buffer, and outputs a first pair of output clocks or a second pair of output clocks as an output clocks, the first pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the multi-phase clocks, and the second pair of output clocks is based on the same frequencies as the multi-phase clocks.
11 Citations
14 Claims
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1. A clock control circuit comprising:
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a first buffer that receives a first pair of input clocks of multi-phase clocks, buffers and outputs the first pair of input clocks; a second buffer that receives a second pair of input clocks of the multi-phase clocks, and is controllable to buffer and output the second pair of input clocks or to output a fixed level; and a frequency multiplier that performs a logical operation on an output of the first buffer and an output of the second buffer, and outputs a first pair of output clocks or a second pair of output clocks as an output clocks, the first pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the multi-phase clocks, and the second pair of output clocks is based on the same frequencies as the multi-phase clocks. - View Dependent Claims (2, 3, 4, 5)
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6. A clock control circuit comprising:
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a phase shift circuit that receives first multi-phase clocks and outputs second multi-phase clocks which are obtained by phase-shifting a predetermined clock; a first buffer that receives a first pair of input clocks of the second multi-phase clocks, and buffers and outputs the first pair of input clocks; a second buffer that receives a second pair of input clocks of the second multi-phase clocks, and is controllable to buffer and output the second pair of input clocks or to output a fixed level; a first frequency multiplier that performs a logical operation on an output of the first buffer and an output of the second buffer, and outputs a first pair of output clocks or a second pair of output clocks as an output clock, the first pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the first multi-phase clocks, and the second pair of output clocks is based on the same frequencies as the first multi-phase clocks; a third buffer that receives a third pair of input clocks of the second multi-phase clocks, and buffers and outputs the third pair of input clocks; a fourth buffer that receives a fourth pair of input clocks of the second multi-phase clocks, and is controllable to buffer and output the fourth pair of input clocks or to output a fixed level; and a second frequency multiplier that performs a logical operation on an output of the third buffer and an output of the fourth buffer, and outputs a third pair of output clocks or a fourth pair of output clocks as an output clock, the third pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the first multi-phase clocks, and the fourth pair of output clocks is based on the same frequencies as the first multi-phase clocks. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A receiver comprising:
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a clock control circuit including a phase shift circuit that receives first multi-phase clocks and outputs second multi-phase clocks which are obtained by phase-shifting a predetermined clock, a first buffer that receives a first pair of input clocks of the second multi-phase clocks, buffers and outputs the first pair of input clocks, a second buffer that receives a second pair of input clocks of the second multi-phase clocks, and is controllable to buffer and input the second pair of input clocks or to output a fixed level, a first frequency multiplier that performs a logical operation on an output of the first buffer and an output of the second buffer, and outputs a first pair of output clocks or a second pair of output clocks as an output clock, first pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the first multi-phase clocks, and the second pair of output clocks is based on the same frequencies as the first multi-phase clocks, a third buffer that receives a third pair of input clocks of the second multi-phase clocks, buffers and outputs the third pair of input clocks, a fourth buffer that receives a fourth pair of input clocks of the second multi-phase clocks, and is controllable to buffer and output the fourth pair of input clocks or to output a fixed level, and a second frequency multiplier that performs a logical operation of an output of the third buffer and an output of the fourth buffer, and outputs a third pair of output clocks or a fourth pair of output clocks as an output clock, the third pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the first multi-phase clocks, and a fourth pair of output clocks is based on the same frequencies as the first multi-phase clocks; a data determination circuit that determines data based on a first output clock from the clock control circuit; a boundary determination circuit that determines a boundary based on a second output clock from the clock control circuit; and a clock data recovery that controls a phase interpolator based on outputs of the data determination circuit and the boundary determination circuit.
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14. A communication device comprising:
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a receiver receives an input signal from an external device; a signal processing circuit processes the input signal that is input via the receiver; and a transmitter output an output signal that is processed by the signal processing circuit to the external device, wherein the receiver comprising; a clock control circuit including a phase shift circuit that receives first multi-phase clocks and outputs second multi-phase clocks which are obtained by phase-shifting a predetermined clock, a first buffer that receives a first pair of input clocks of the second multi-phase clocks, buffers and outputs the first pair of input clocks, a second buffer that receives a second pair of input clocks of the second multi-phase clocks, and is controllable to buffer and input the second pair of input clocks or to output a fixed level, a first frequency multiplier that performs a logical operation on an output of the first buffer and an output of the second buffer, and outputs a first pair of output clocks or a second pair of output clocks as an output clock, first pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the first multi-phase clocks, and the second pair of output clocks is based on the same frequencies as the first multi-phase clocks, a third buffer that receives a third pair of input clocks of the second multi-phase clocks, buffers and outputs the third pair of input clocks, a fourth buffer that receives a fourth pair of input clocks of the second multi-phase clocks, and is controllable to buffer and output the fourth pair of input clocks or to output a fixed level, and a second frequency multiplier that performs a logical operation of an output of the third buffer and an output of the fourth buffer, and outputs a third pair of output clocks or a fourth pair of output clocks as an output clock, the third pair of output clocks is based on a frequency which is obtained by multiplying frequencies of the first multi-phase clocks, and a fourth pair of output clocks is based on the same frequencies as the first multi-phase clocks; a data determination circuit that determines data based on a first output clock from the clock control circuit; a boundary determination circuit that determines a boundary based on a second output clock from the clock control circuit; and a clock data recovery that controls a phase interpolator based on outputs of the data determination circuit and the boundary determination circuit.
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Specification